What are the coordinates of the two points that the blue point is exactly in the middle of?
Now for the advanced student:
Which point is in the middle of the centres of enlargements?
If you can't see the images above it may be because you do not have a recent version of the Flash Player installed or that your device (such as the iPad) cannot show Flash diagrams.
The large red shape is an enlargement of the small red shape.
The large blue shape is an enlargement of the small blue shape.
[One small square represents one unit]
Teacher: Right click the diagram to zoom in.
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For the advanced student:
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